Testing Locations » Texas » Dallas TX » Quest Diagnostics – Margo Perot – Employer Drug Testing Not Offered Quest Diagnostics – Margo Perot – Employer Drug Testing Not Offered Quest Diagnostics – Margo Perot – Employer Drug Testing Not Offered8160 Walnut Hill LaneSuite 315Dallas, TX 75231-4339 United States On the Presbyterian (Dallas) campus in the Margo Perot Building.
